The cases of 18 adults patients operated on by ventriculoperitneal shunt with valve are reported. There was increased intracranial pressure in 17 cases. The shunt has functioned perfectly in 10 cases followed postoperatively from 2 to 48 months. Six patients died, being impossible the follow-up in the 2 remaining cases. Autopsy examination of 2 patients performed at 1 and 9 months after operation disclosed shunts to be patent. Adhesions or peritonitis were not found. Obstruction of the peritoneal and of the catheter did not occurred.